/*
 * @Author: szx
 * @Date: 2021-11-02 14:38:09
 * @LastEditTime: 2021-11-02 14:50:21
 * @Description:
 * @FilePath: \leetcode\200-299\297\297.cpp
 */
#include <iostream>
#include <list>
#include <string>
using namespace std;
struct TreeNode {
    int val;
    TreeNode* left;
    TreeNode* right;
    TreeNode() : val(0), left(nullptr), right(nullptr) {}
    TreeNode(int x) : val(x), left(nullptr), right(nullptr) {}
    TreeNode(int x, TreeNode* left, TreeNode* right)
        : val(x), left(left), right(right) {}
};



int main() {
 
}
